Fi 33 HORIZONTAL SECTION OF CEREBRUM. THE INTERNAL CAPSULE AND AD- 

 JOINING NUCLEI. a, Corpus callosum. b, Septum lucidum. c, Anterior pillars of fornix. 

 d, Middle commissure. <?, Pineal gland and posterior commissure, f, Corpora quadri- 

 gemina. g, Upper surface of cerebellum, h, h, Longitudinal fissure, i, Caudate nucleus. 

 j, External capsule, k, Claustrum. /, Lenticular nucleus. Note that the claustrum and 

 the lenticular nucleus are closely approaching each other at their posterior portions. 

 Deeper down they become continuous, m, Anterior limb, n, Knee, and o, Posterior limb 

 of the internal capsule, p, Optic thalamus. q, Middle horn, containing the choroid 

 plexus, r, Hippocampus major, s, Anterior horn. /, Third ventricle, x, Foramen of 

 Monro. The base of it. 



